聚丙烯酰胺/壳聚糖季铵盐半互穿网络水凝胶的制备及其对水溶液中腐殖酸的吸附性能
[Preparation of PAAm/HACC Semi-Interpenetrate Network Hydrogel and Its Adsorption Properties for Humic Acid from Aqueous Solution].
作者信息
Liu Ze-Jun, Zhou Shao-Qi, Ma Fu-Zhen
机构信息
School of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510640, China.
出版信息
Huan Jing Ke Xue. 2018 Mar 8;39(3):1233-1240. doi: 10.13227/j.hjkx.201707019.
New absorbents, polyacrylamide/chitosan quaternary ammonium salt semi-interpenetrate network hydrogels[(PAAm/HACC semi-IPN), (s-IPN 1.5), and (s-IPN 3)], were successfully prepared via in situ polymerization by thermal synthesis for the removal of humic acid (HA) from aqueous solution. The materials were characterized by SEM, FT-IR, and XRD. The adsorption behaviors of adsorbents for HA were investigated as a function of pH, ionic strength, contact time, initial HA concentration, and temperature. The results showed that s-IPN 3 outperformed s-IPN 1.5. The adsorption capacity of the adsorbent for HA decreased with an increase in solution pH and decrease of temperature, and low ionic strength was conducive to the adsorption of HA. The adsorption kinetics fitted to a pseudo-second-order kinetic model and the adsorption isotherms could be described by the Sips isotherm model. The impressive maximum adsorption capacity could reach 238.08 mg·g at the condition of pH=7.0, ionic strength=0.01 mol·L, and =298 K. The adsorbent could remove HA from aqueous solution efficiently.
通过热合成原位聚合法成功制备了新型吸附剂聚丙烯酰胺/壳聚糖季铵盐半互穿网络水凝胶[(PAAm/HACC半互穿网络),(s-IPN 1.5)和(s-IPN 3)]，用于从水溶液中去除腐殖酸(HA)。通过扫描电子显微镜(SEM)、傅里叶变换红外光谱(FT-IR)和X射线衍射(XRD)对材料进行了表征。研究了吸附剂对HA的吸附行为随pH值、离子强度、接触时间、初始HA浓度和温度的变化。结果表明，s-IPN 3的性能优于s-IPN 1.5。吸附剂对HA的吸附容量随溶液pH值的升高和温度的降低而降低，低离子强度有利于HA的吸附。吸附动力学符合准二级动力学模型，吸附等温线可用Sips等温线模型描述。在pH=7.0、离子强度=0.01 mol·L、温度=298 K的条件下，最大吸附容量可达238.08 mg·g 。该吸附剂能有效地从水溶液中去除HA。
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